refactor: remove nested loop

lib/plugins/wallet/bitcoind/bitcoind.js

@@ -128,12 +128,12 @@ function cryptoNetwork (account, cryptoCode) {
 
 function fetchRBF (txId) {
   return fetch('getmempoolentry', [txId])
-    .then((res) => _.assign(_.pick(['bip125-replaceable'], res)), { tx_hash: txId })
+    .then((res) => {
+      return [txId, res['bip125-replaceable']]
+    })
     .catch(err => {
       if (err.code === -5) console.log(`${err.message}`)
-      const result = { tx_hash: txId }
-      result['bip125-replaceable'] = true
-      return result
+      return [txId, true]
     })
 }